Understanding Volcanoes
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Questions and Answers

What is the primary reason for pyroclastic surges being more deadly than pyroclastic flows?

  • The superheated ash ejected from the volcano
  • The size and weight of the solid fragments
  • The poisonous gases contained in the pyroclastic clouds (correct)
  • The speed at which pyroclastic surges travel

    • What is the main difference between pyroclastic flows and tephra?

  • Composition of poisonous gases
  • Speed of travel away from the volcano
  • Distance traveled from the eruption site
  • Size of solid fragments ejected (correct)

    • Why is tephra often referred to as blocks or bombs?

  • Because they are propelled from the volcano at high speeds (correct)
  • Due to their explosive nature
  • Based on their aerodynamic shape
  • For their resemblance to explosive devices

    • What potential hazard, apart from destruction of vegetation, is associated with tephra?

    <p>Generation of lightning strikes</p> Signup and view all the answers

    What characteristic makes tephra extremely destructive to individuals and property?

    <p>High speeds at which they travel</p> Signup and view all the answers

    Which volcanic eruption resulted in the loss of food supplies for thousands due to tephra destruction?

    <p>Tambora eruption in 1815</p> Signup and view all the answers

    Why are pyroclastic surges more deadly than pyroclastic flows despite having equal temperatures?

    <p>Presence of poisonous gases and steam in the pyroclastic clouds</p> Signup and view all the answers

    What characteristic differentiates tephra from pyroclastic flows in terms of speed?

    <p>Speed at which solid fragments are ejected</p> Signup and view all the answers

    What danger is posed by the thick layers of ash associated with tephra?

    <p>Respiratory health impact across a wide region</p> Signup and view all the answers

    What is the primary difference between pyroclastic flows and pyroclastic surges?

    <p>The distance they can travel away from the volcano</p> Signup and view all the answers

    Why are pyroclastic clouds considered dangerous to living organisms?

    <p>They contain superheated ash and gases</p> Signup and view all the answers

    What makes tephra different from pyroclastic flows?

    <p>The size of the solid fragments</p> Signup and view all the answers

    How do tephra cause destruction to individuals and property?

    <p>By traveling at high speeds</p> Signup and view all the answers

    What is a common feature of tephra that makes them hazardous to individuals?

    <p>Their electric charge at high altitudes</p> Signup and view all the answers

    Why are pyroclastic surges more likely to result in human casualties?

    <p>Due to the presence of steam in the cloud</p> Signup and view all the answers

    Which hazard is NOT mentioned as a consequence of tephra eruptions?

    <p>Acid rain formation</p> Signup and view all the answers

    What distinguishes pyroclastic surges from pyroclastic clouds?

    <p>The direction they move in relation to the volcano</p> Signup and view all the answers

    What is a significant characteristic of tephra that contributes to their destructive potential?

    <p>Their weight and size compared to other volcanic matter</p> Signup and view all the answers

    What is a key reason tephra is considered dangerous during volcanic eruptions?

    <p>Their potential to travel at high speeds far from the volcano</p> Signup and view all the answers

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